Motor for pressing machines and the like



Sept. 29, 1936. M DEWEY 2,055,815

MOTOR FOR PRESSING MACHINES AND THE LIKE Filed March 9, 1935 INVENTORATTORNEY Patented Sept. 29, 1936 UNITED STATES PATENT OFFICE MOTOR FORPRESSING MACHINES AND THE LIKE Application March 9, 1935, Serial No.10,167

3 Claim.

This invention relates to power means for moving a body from a positionof rest and more particularly to a specific arrangement of the powermeans to quickly overcome the inertia of a stationary body to set thesame in motion.

My invention provides motors or greater and lesser power, each having,operative connections with the body to be moved, means for firstactuating the motor or greater power to set the body in motion, andmeans actuable thereafter for energizing the motor of lesser power tocontinue the body in motion.

Another feature or my invention is the provision of motors of greaterand lesser power respectively for actuating a moving body, and means forenergizing the motors sequentially, said means operating and energizingthe motor of greater power first.

Another feature of my invention is the provision of motors of greaterand lesser power for actuating a moving body, together with controlmechanism by which the motor of greater power is actuated first toovercome the inertia of the stationary body, and means actuated by apredetermined movement 01 the motor of greater power for energizing themotor of lesser power.

My invention also contemplates a specific application 01 a two-motorarrangement as above described in the operation of a pressing machine.

Other objects and advantages of my invention include a specificarrangement of two axially aligned fluid motors with the specialarrangement of their parts so that one of said fiuid motors which is ofgreater power than the other, actuates a moving body irom a position ofrest and thereafter the fluid motor 01' lesser power is actuated tocontinue the body in motion.

The drawing illustrates a pressing machine shown in end elevation,certain portions being shown in section and the control mechanism beingillustrated diagrammatically.

I have illustrated my invention as applied to a pressing machine of awell known type embodying a frame l upon which is mounted a stationarypressing bed H. A bracket of the frame carries a pivoted head lever l2which carries a pressing head It adapted to coact with the bed I I forthe pressing operation when the pressing members are engaged. Foractuating the head lever I connect a pair of toggles I4 between the rearend of the head lever and a part of the frame and connect powermechanism to the knuckle l5 of the toggles for moving them from thebroken position of the drawing to a straightened position to causepressing or ironing engagement between the head and bed pressingmembers. A spring l6 connected between the rear end of the head leverand the frame serves to bias the pressing head in the open position ofthe drawing.

The power means for actuating the pressing head comprises two motors,one having greater power than the other, each of the motors beingoperatively connected to the body to be moved, and control mechanismwhereby the motor of greater power is actuated first and after apredetermined movement of this motor the motor of lesser power isenergized. In the embodiment illustrated the head pressing member i 3 isthe body to be moved from a position of rest as shown in the drawing,the motor of greater power is indicated generally at H and is actuatedfirst to overcome the inertia of the head l3 and the connected parts,and thereafter the motor of lesser power indicated generally at I8 isactuated to maintain the movement of the head until it finally engagesthe bed H.

It will be obvious to any skilled mechanic that the motors I1 and I8need not necessarily be arranged in a unitary structure as shown butmight be separately constructed motors having separate connections withthe body to be moved. However, in the form shown I have a very compactstructure comprising a cylinder of greater diameter l9 and a cylinder oflesser diameter axially aligned and rigidly connected with the twocylinders concentric, A piston rod 2| extends through both cylinders andis pivotally connected to the toggle knuckle i5 at the end near thecylinder of lesser diameter. A large piston 22 reciprocable in cylinderl9 abuts the free end of rod 2|. A small piston 23 reciprocable incylinder 20 is rigidly connected to the rod 21. It is obvious thereforethat piston rod 2| performs the double duty of an operative connectionbetween both pistons 22 and 23 and the toggles I4.

The control mechanism is arranged to operate pistons 22 and 23successively and in order to accomplish this I have caused theenergization of piston 23 to be dependent upon a predetermined travel ofpiston 22. This arrangement comprises the supply of motive fluid firstthrough conduit 24 to the working face of piston 22 and an open port 25in the wall of cylinder l9 adapted to be uncovered after a predeterminedtravel of piston 22 whereupon motive fiuid will travel through apassageway 26 which communicates between port 25 and the working face ofpiston 23. In the position of the parts shown in full lines in thedrawing, piston 23 covers port 21 where passageway 26 enters cylinder 20but it will be obvious that upon movement of piston 22 to its brokenline position piston 23 will have moved sufliciently to uncover port 21.Passageway 26 is shown as a cored opening in the casting which providescylinders l9 and 20 but it will be obvious that other constructionsmight be used.

For safety of operation I provide a two-hand control mechanism for thesupply of motive fluid to motor I! and a means for maintaining thetwo-hand control mechanism in its operated position upon the completionof the power stroke of motor 18. This construction comprises a pair ofvalve casings 28 and 29 each housing a normally closed inlet valve 28a,29a and a. normally open outlet valve 28b, 29b mounted on common valvestems 28c, 29c and operable by manuals 28d, 29d. Each manual is alsoprovided with a laterally extending arm 284:, 296 which engages a rodconnected to a maintaining piston 28}, 29} which is supplied withpressure fluid upon completion of the stroke of motor "3 through conduit30 which communicates with a port 34 which is uncovered by a piston 23near the end of its power stroke. The supply of motive fluid to motor II is by way of conduit 3!, valve casing 28, conduit 32, valve casing 29and conduit 24.

The operation of the mechanism described with the parts in the positionshown in the draw-. ing, is as follows: The operator arranges work to bepressed upon the bed II and actuates manuals 28d and 29d. Both manualsmust be actuated and held actuated as the release of either one willpermit the exhaust of motive fluid through one of the normally openvalves 28b and 2911. If both manuals are held depressed. motive fluidflows through conduits 3|, 32 and 24 to the working face of piston 22which, being of..large diameter, supplies sufflcient power to to'gg'lesl4 to move the weight of head member l3 and the connected mechanismrapidly from a position of rest to set the parts in motion. When piston22 has moved to the broken line position shown, it uncovers port 25 andmotive fluid is admitted to passage 26 and to the working face of piston23. The free connection at 33 between piston 22 and rod 2| then becomesseparated as piston 23 continues to travel rearwardly in cylinder 20 tocontinue the motion of head l3 toward the bed ll. When piston 23 reachesthe broken line position indicated in the drawing, toggles I4 have beennearly straightened and the pressing members are in engagement. At thistime, piston 23 hasuncovered port 34 which admits motive fluid throughconduit 30 beneath pistons 28) and 29f which serves to hold manuals 28dand 29d in their actuated positions, whereupon the operator may releasethe manuals and the supply of motive fluid to both motors I1 and illwill be maintained. To open the press, either of the manuals is actuatedagainst the holding piston to open valve 2812 or 29b and close valve 28aor 29a which cuts off the supply of motive fluid and exhausts bothmotors, whereupon spring !6 returns the parts to the position shown infull lines in the drawing.

What I claim is:

1. In a pressing machine, a pair of coacting relatively movable pressingmembers, a cylinder of larger diameter, a cylinder of smaller diameter,said cylinders being axially aligned, a piston rod in said cylinders andoperatively connected at its end nearer the smaller diameter cylinderwith one of said pressing members, large and small pistons in saidcylinders of larger and smaller diameters respectively, said smallpiston being rigidly connected with said rod, said large piston abuttingthe free end of said rod, a port in the wall of said larger diametercylinder adapted to be uncovered upon a predetermined travel of saidlarge piston, a passageway leading from said port to the working face ofsaid small piston, and means for supplying motive fluid to the workingface of said large piston.

2. In a pressing machine, a pair of coacting relatively movable pressingmembers, a cylinder casing providing adjoining cylinders of larger andsmaller diameters concentric and in open communication, a piston rod insaid cylinders and operatively connected at its end nearer the smallerdiameter cylinder with one of said pressing members, large and smallpistons in said cylinders of larger and smaller diameters respectively,said small piston being rigidly connected with said rod, said largepiston abutting the free end of said rod, a port in the wall of saidlarger diameter cylinder adapted to be uncovered upon a predeterminedtravel of said large piston, a passageway leading from said port to theworking face of said small piston, and means for supplying motive fluidto the working face of said large piston.

3. In a pressing machine, a pair of coacting relatively movable pressingmembers, a toggle for causing relative movement of said pressingmembers, said toggle being arranged to break inwardly and movable towardstraightened position to close the press, a cylinder of larger diameter,a cylinder of smaller diameter, said cylinders being axially alined, apiston rod in said cylinders and connected at its end nearer the smallerdiameter cylinder with said toggle, large and small pistons in saidcylinders of larger and smaller diameters respectively, said smallpiston being rigidly connected with said rod, said large piston abuttingthe free end of said rod, and means for controlling actuation of both ofsaid pistons in the same direction for causing relative movement of saidpressing members to close the press.

- JAMES M. DEWEY.

